<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Andale Mono; font-size: 10pt; color: #000000'>We use 4.2.3-p1 built from source on generic (bootstrapped) linux. We notice that it crashes more often than not when working with a renewal packet (I think only renewals) in DHCPv6. I believe that I saw somewhere that ISC is aware of the problem and is working on a solution. To be clear, we do not get any buffer overflow messages in the syslog.<br><br><div><br></div><hr id="zwchr"><blockquote style="border-left:2px solid rgb(16, 16, 255);margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Fred Zwarts (KVI)" <F.Zwarts@KVI.nl><br><b>To: </b>dhcp-users@lists.isc.org<br><b>Sent: </b>Friday, March 30, 2012 6:21:06 AM<br><b>Subject: </b>dhcpd -6: buffer overflow detected<br><br>We are using the ISC dhcpd server for both IPv4 and IPv6 for more than a <br>year now. Up to recently, the Suse distribution included only version 3 of <br>isc dhcp, so, in order to run in IPv6 mode, we downloaded the isc dhcp <br>source code and built the server ourselves.<br>We worked around a few problems for IPv6 and finally the dhcpd-4.2.1-P1 <br>version was running in a stable mode for many months now on a Suse Linux <br>Enterprise System 11 SP1 x86_64 system, both for IPv4 and IPv6.<br>Yesterday, we installed Service Pack 2 for SLES11, which now contains isc <br>dhcpd 4.2.3-P2.<br>In IPv4 mode, it was no problem to run the new dhcpd server with exactly the <br>same configuration as before.<br>However, in IPv6 mode the dhcpd server runs for something like one minute <br>and then stops. In the syslog we find the message:<br><br>Mar 29 13:30:10 SRV014 dhcpd: *** buffer overflow detected ***: <br>/usr/sbin/dhcpd6 terminated<br><br>We have tried several time to run the dhcpd server, but each time it crashes <br>in the same way after about one minute. This happens also when the server <br>runs in foreground mode.<br><br>Fortunately, we still have the executable of the 4.2.1-P1, so we changed <br>the soft link /usr/sbin/dhcpd6 to point to this old image. Now the server <br>does not crash anymore.<br><br>We don't know how exactly the 4.2.3-P2 version was built by Suse. So we are <br>not sure whether this problem is caused by the way the source code was <br>compiled, or by a change introduce between the releases of these two <br>versions.<br>Also we don't know whether there is a specific part in our configuration, or <br>a specific packet sent by a client that triggers the crash.<br>So, my question is whether someone else uses 4.2.3-P2 in IPv6 mode without <br>problems.<br>Also suggestions for diagnosing the problem further are welcome.<br><br>Fred.Zwarts. <br><br>_______________________________________________<br>dhcp-users mailing list<br>dhcp-users@lists.isc.org<br>https://lists.isc.org/mailman/listinfo/dhcp-users<br><br></blockquote><br></div></body></html>